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19999909 is a prime number
BaseRepresentation
bin100110001001…
…0110010100101
31101122002201101
41030102302211
520104444114
61552400101
7331665526
oct114226245
941562641
1019999909
1110320256
126846031
1341b3387
14292884d
151b50d74
hex1312ca5

19999909 has 2 divisors, whose sum is σ = 19999910. Its totient is φ = 19999908.

The previous prime is 19999897. The next prime is 19999927. The reversal of 19999909 is 90999991.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15602500 + 4397409 = 3950^2 + 2097^2 .

It is a cyclic number.

It is not a de Polignac number, because 19999909 - 213 = 19991717 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 19999909.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19999999) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9999954 + 9999955.

It is an arithmetic number, because the mean of its divisors is an integer number (9999955).

Almost surely, 219999909 is an apocalyptic number.

It is an amenable number.

19999909 is a deficient number, since it is larger than the sum of its proper divisors (1).

19999909 is an equidigital number, since it uses as much as digits as its factorization.

19999909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 531441, while the sum is 55.

The square root of 19999909 is about 4472.1257808787. The cubic root of 19999909 is about 271.4413499722.

The spelling of 19999909 in words is "nineteen million, nine hundred ninety-nine thousand, nine hundred nine".